The magnetic field produced by electromotive forces of the heart, which is mostly recorded on the anterior chest wall, is called Magnetocardiogram (MCG). The mapping of the MCG is one of methods for studying the source localization of activities. Since MCG was first measured by Baule and McEee[1], the MCG has been studied worldwide. In partcular, it is known that Cohen and his coworkers measured the MCG by use of a SQUID inside a magnetically shielded room [2]. Severla studies have been reported on non-invasive MCG localization of the ventricular pre-excitation site in the PWP syndrome [3-5]. However, MCG had not been widely used because the method for obtaining an MCG is very cumbersome and the liquid helium coolant is very expensive. For these reasons, High-Te SQUID has been receiving attention as a diagnostic technique for observing the electrical activities of the heart.
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